Composite additive manufacturing method for forming complex component through anisotropy

The invention discloses a composite additive manufacturing method for forming a complex component by utilizing anisotropy, belongs to the technical field of additive manufacturing by utilizing metal powder, and is used for solving the problems that in the prior art, after the complex component is formed by adopting additive manufacturing, the morphology of an internal structure is difficult to change again, and the forming size is limited by equipment. The method comprises the steps that a blank model is designed, and a preset vacancy is arranged on the blank model; the width of the preset vacancy is smaller than that of the hole of the final component in the drawing direction; in the direction perpendicular to the drawing direction, the width of the preset vacancy is larger than that of the final component hole; a blank is manufactured in an additive manufacturing mode, the scanning strategy located on the lower layer is the same as the scanning strategy located on the upper layer, and the blank comprises a